Ex.6

https://drive.google.com/file/d/10LBwSUIXvubyiqXQK0YSOX-5L7y4hQDL/view?usp=sharing
http://gcek.ac.in/ece/fdp/materials/2/Dr.Sreekumar/e-books/Book_Modern%20Control%20Engineering_K.%20Ogata.pdf